How can one ensure that the file path and name are accurately passed to PHP variables?

To ensure that the file path and name are accurately passed to PHP variables, you can use the $_SERVER['DOCUMENT_ROOT'] variable to get the root directory of the server and concatenate it with the file path and name. This will provide the full and accurate path to the file.

$filePath = $_SERVER['DOCUMENT_ROOT'] . "/path/to/file/filename.txt";